For an intro, this is waaay waaay too long.
I like the idea, but this intro was lacking in variety. Each character was drawn the same way, in the same pose, from the same angle. It would have been nice to see some variety in their design, or where they came from... maybe they each have their own title screen?
I would suggest researching other cartoon intros of the past and watching just how pacey and quick they make them. For quick little 7 minute eps the intros are only really several seconds... for half hour shows the intros tend to be 30 seconds, but you really dont need anything that long for something like this.
Sorry to sound harsh, I just reckon this needs work in order to really pull people in. Best of luck though dude, keep going!